Sorry, I spent few days in Budapest and wasn’t lucky enough to get fast WiFi 
About framerate… just go to properties of “Limit Frames” widget. There’s “Min Value” property in Slider section. Set value that suits you 
Generally it’s helpful to check properties of panels and widgets, there’s lots of params.
There’s no functionality for gamma slider. I don’t need it personally yet, if it’s important for somebody, please use PayPal tip and I’ll make it ASAP